Independent synchronization



Nov. 17, 1953 H. R. NILSSON ETAL 2,659,239

INDEPENDENT SYNCHRONIZATION Filed Sept. 27, 1950 3 Sheets-Sheet l N 17, 1953 H. R. NILSSON ET AL 59,239

INDEPENDENT SYNCHRONIZATION Filed Sept. 27, 1950 3 Sheets-Sheet 2 Nov. 17, 1953 H, NILSSON ET AL INDEPENDENT SYNCHRONIZATION 3 Sheets-Sheet 5 Filed Sept. 27 1950 2 7 869 6 9 6 fiwnfiw as 7 Patented Nov. 17, 1953 INDEPENDENT SYNCHRONIZATION Hans Robert Nilsson, Stockholm, and Sven Ivar Trulsson, Enskede, Sweden, assignors, by mesne assignments, to Jarvis 0. Marble, New York, N. Y., Leslie M. Merrill, Westfield, N. 3., and Percy H. Batten, Racine, Wis., trustees Application September 27, 1950, Serial No.'1ss,94s

Claims priority, application Sweden October 7, 1949. v

devices of the kind in which the rotor bodies are provided with helical lands and grooves which intermesh in cooperative relation to provide chambers of variable volume used to compress orexpand elastic fluid, and still more particularly the invention relates to such devices in which the pairsv of intermeshing'rotor bodies each comprise a male rotor the lands of which lie substantially outside the pitch circle of the rotor and a female rotor the grooves of which lie substantially within the pitch circle of the rotor.

Devices of the kind under consideration may be constructed with rotors comprising, a plurality of aligned rotor bodies mounted to rotate about the same axis, with the different rotor bodies intermshing respectively with different aligned bodies of a cooperating rotor. Such constructions, however, have presented serious difiicule ties from the standpoint of obtaining the required synchronized relationship of all'of the intermeshing parts, and it is the general object of the present invention to provide new and improved rotor constructions of the kind under" consideration.

which enable the various rotor bodies of multiple rotor devices comprising multiple bodied rotors to be readily adjusted in desired relation to each other. 7 I I To this end the invention contemplates the provision of rotors comprising shaft parts carrying rotor bodies, some of which are in fixed relation to the shaft parts and others of whichare angularly adjustable relative to the shaft parts, combin'ed with angularly adjustable synchronizing means connecting the shaft parts andalsoconnecting the adjustable rotor bodies. The manner in which the invention may advantageously. be

carried into effect will best be understood from.

a considerationof the ensuing portion of this specification, taken in conjunction with the accompanying drawings, which discloses byway of example but without limitation different embodi ments of apparatus for carrying the invention into effect. I v

In the drawings:

Fig. .1 illustrates in horizontal section anlembodiment of the device applied to a compressor. Said figure shows in heavier lines those cooperating rotors provided with helical lands and grooves.

which are first to be synchronized with each other, while 'Fig. 2 shows in heavier lines those cooperating rotors which are then to be synchro- I received in arcuate slots I 9' in the this arrangement permitting relative adjustment means of a key I], fixed afiange nized with each other. Fig. 3 is a vertical section of the compressor shown in Figs. 1 and 2 taken onthe center line of the compressor.

Fig. 4 is a diagrammatic view of another em-.

bodiment of the device used in an engine provided wtih three shafts, two rotors being arranged on each'shaft. Fig. 5 is a longitudinal section of a further embodiment of the device used in an engine provided with two shafts, three rotors being arranged on each shaft. v

. Fig. 6 shows a modification of the device illustrated in Fig. 4, inwhich another synchronizing device is used for synchronizing the, rotors fixed on the two lateral; shafts.

Fig. 7 shows an end elevational view of the apparatus of Fig.1 with the cover plate removed and particularly showing the structure permitting relative adjustment of the two synchronizing gears. .V

In the embodiment of-the compressor illus-. trated in Figs. 1, 2 and 3, numeral I designates the housing of the compressor, said housing having partially double walls for cooling with a liquid orwith a gaseous medium. In the two end walls 2, 3 of the housing are arranged bearings 4, 5 and 6,. 7 respectively, for carrying two sets of rotors 8, 9 and Hi, I l respectively'O-f these rotors;,.those designated by 9, I I are fixed on a shaft I2 and the rotor I0 is likewise ,fixed on a shaft I3, whereas the rotor :8 isadjustable in different angular positions on ,the'shaft it. To the end portion of the shaft. I2 is fixed a hub I4of a gear wheel, the gear rim iii of which is adjustable in the desiredangular position in relation to the hub I4 bymeans. of studbolts It. As-shown in Fig. 7, the bolts It areslidably received inarcuate slotsIEf in thegear I5,.thus;permitting relative adjustmentbetween the gear I5 and the hub. 14. To the end portion of the other shaft 7 I9serving as a support hub fora second gearjwheel I8. rigidly connectedwith therotort. vSaid flange isar-i rangedtobe connected with the gear Wheel I8 by means of stud bolts 29 by which it will bepossiv ble to adjust the gear wheel. I8 indiiferent'angul l3 and in' connection therewlth the angular position of the With fur-m lar positions with respect to the shaft rotortwith respect to said shaft I 3. ther reference to'Fig. 7 the boltsifl are slidably between the'gear I8 and'such flange. Numeral 2| denotes a seal between compressor.

[3 is; by.

the two sections of the I In the vertical section of the compressorshown in Fig. 3, numeral I designates the housing of the compressor, 2 and 3 the two end walls, 8 and In the two rotors arranged in arow, I8 the gear wheel connected with the rotor s ame IS the flange connected with the shaft l3; Numeral 22 designates the air inlet and 23 the air outl t in the one section of the compressor, while 24 and 25 denote the corresponding inlet; andoutleam the other section of the compressor In those 2-shaft compressorsi or motors which the one shaft carries rotors the lands; of

which are located substantially outside the. pitch while the other two rotors 54 and 56 are adjustable in different angular positions in relation to :theshaft 53. In this embodiment a synchronizcircle of said rotors (so-called male; rotors) and the other shaft carries rotors the grooves, of

which are located substantially'in'side the'pitch circle of the respective rotor (SQ-called female rotors), the rotor or rotors adjustable inf .clii-.

ferent angular positions preferably being female rotors. ,7

When synchronizing the rotors shown in Figs. 1, 2 and 3 the cooperating rotors 8, 9 which are arranged in that. end portion of the housing} which faces the synchronizing gear l5, i8, are first set by adjusting the gear-rim |-on the-gear wheel hub M which is rigidly connected with the one shaft i2 whereby. these rotors are syn= chronized, the one rotor H of the second set of rotors arranged on said shaft being at the-same time fixed in relation to the synchronization: The other rotor ill of this set is-then adjusted with a predetermined clearance between menses of this rotor and thelands of the rotor cooperating with therotor l0, and. is fixed in this of Said shafts.

position in relation to the synchronizing gear by the flange l9 rigidly connected with theend of the shaft l3. This can preferably be-"accomplished with the aid of stud bolts 20 which are inserted in arcuate slots in the flange l9 and threadedly received in the gear wheel |-8 arranged on said shaft. By these two operations the two rotor sets can thus be synchronized quickly and veryaccurately.

In the embodiment illustrated diagrammatically in Fig. 4 two rotors, 28 are fixed on a shaft 26 On both sides of this shaft 26 are-arranged two. other shafts 29,- 30. which carry rotors cooperating with the rotors on the intermediate shaft 26. On each of these shafts is fixed'arotor 3| and 32 respectively, and a rotor seamen respectively is turnably mounted on each of 'said shafts. On the one end portion of the-intermediate shaft 26 is mounted a gear wheel in mesh with gear rims i 36, 31. 'S'aid-'gear-' rims are adjustable to different angular-positions in relation to wheels40, 4| rigidly connected with the rotors 33, 34by means of-the hollow shafts 38, 39 .ofsaid rotors, said wheels 40, 4| being turn, by means of flanges fixed on-the shafts-29; 30, adapted to be locked in different angular positions in relation tosaid shafts in the same'manner as describedabove-in connection with Fig: 11

.In' this embodiment each of the morass, is first synchronized with theintermediate rotor 2'! by means of the gear rims 3|i 31 intermeshing the gear Wheel 35 and lockable in different angular positions in relation to the-gear wheels-45, 4|, and then the rotors 3| a'nd32 are synchronized with the intermediate rotor 28 by'lockingin desired angular positions the flanges 42, 43 fixed to, the shafts 29, 30 of said rotors with the gear wheels 40, 4|. I

In the embodiment "shown in Fig. 5, numeral 44 denotes a shaft carried by twobeari'ngs "4'6, 41' arranged in a rotor housing '45. Three rotors 48, 49, 55 are fixed on said shaft. Another shaft positions in relation to the shafts B3, 65;

ing de vice similar tothat described in connection .with'Figs. laud '2'is used for synchronizing the rotor sets, 48., 54: and 49, 55, and therefore the corresponding. reference numerals have been used :in Fig.5; In order to prevent leakage between the different, sections seals 51, 58 are arranges-between the different rotor sets. At the opposite .end of the engine the rotor 56 turnably arranged on the shaft 53 is provided with a flange 6 0 formed on a hollow shaft 59 of said rotor, said flange being lockable in different angular positions in relation to the-shaft 53 by means of. a

game 62 fixed onsaid shaft by means of also}! In the embodiment illustrated in Fig. 6 are arrangedthree'parallel shafts 63, 64, 55, one end portion ofeach of which is journalled in 'a rot'or housing 12 bymeans of bearings 65, 58, 10. In the opposite end of said housing are arranged threebearings- 61, 69, 1| carrying extension parts The intermediate shaft is pro; vided with two-fixed rotors I3, 14,'while on each oftheother two shafts is fixed a rotor 15,16 and; a-Totor 11,18 turnablyarranged in relation to the shafts 63 and 65, respectively. On the one end portion of the intermediate shaft 64 there is-fixed a gear-wheell9 'intermeshing with ad'- justable gear rims -84, 85 on the gear wheels 82, 8'3fixed' on'the'hollow"shafts 80, 8| of the rotors H, 18 which are adjustable in different angular The tworoto'rs Ti, 18 are synchronized with the rotor 13 fixed on the; intermediate shaft 64 according to the same principle as in theembodiment shown in Fig.4, whilethe'rotors- 15,16 are synchronized withthe'rotor Maxed on the intermediate shaft 64 with the aid of a'devlc'e described hereinafter.

The other rotor H turnably arranged on an extension shaft 8815f thejrotor l5. Into the end portionof this. elongation shaft is scre'wed'a bolt 81, which "at it's' outer end 'is provided with a square head for turningthe bolt with a key; The outer sneer the bolt 8'l'is also provided with threads. On this bolt there is displaceably mounted a sleeve 88 whichfat its inner end is pr vided with external straightSD- ines 89 and with helicalsplines 99,1;the'straight splines 89 enga'g-' in'g corresponding 'spline's or grooves in a bore. 9| made in the 'turnable rotor Tl, while the,

helical s'plines SOfengage corresponding splines or grooves in a bore 92 in the end portion of the extension shaft. Numeral93 denotes lockf nutsfor-the sleeve 88"relati've to the hollow'shaft 8|] andruati sto the bolt 81 respectively; When the sleeve BB-"is displaced on thebolt 91 in one direction (yr-another, the rotor'll will, with the aid of the straight and the helical splines, be turned in either direction in relation to the'roto'r 15, whereafter they are locked in the desired,

angular position in relation to each other by the lock nuts 93 arranged on thes'l'eev'e andon the bolt respectively. After the'rotor 1.5 has been synchronized relation-to the rotor 14, the other rotor 16 can be synchronized with this rotor 14 in a similar manner. Seals 94, 95, 96 are provided between the rotor "sets" as in the other embodimerits. V

By the above described arrangement of two different types of splines for synchronizing, the advantage obtained at the same time is that the torque will be transmitted between the two coaxial rotors at a considerably shorter axial distance than by long power-transmitting shafts extending through hollow shafts and for this reason being weak, whereby the risk of incorrect synchronizing arising in the latter case due to distortion of 171161011 2. weak shaft is eliminated.

Naturally, the invention is not limited to the embodiments now described and disclosed for synchronizing rotors mounted on different shafts, but the same may be varied in a great many different ways within the scope of the invention. Furthermore, this invention may also be used with advantage for synchronizing rotors in motors of the positive displacement type.

We claim:

1. A rotary device having at least two cooperating rotors, each comprising a shaft part and at least two rotor bodies carried by the shaft part, each of said rotors including at least one rotor body fixed relative to the shaft part of the rotor, one of said rotors including a rotor body angularly adjustable relative to the shaft part of the rotor, synchronizing means connecting said shaft parts to turn the rotors in timed relation to each other and adjustable means for holding said adjustable rotor body in selected angular relation to the shaft part of the rotor of which said adjustable rotor body comprises a part.

2. A device as defined in claim 1 in which said synchronizing means is angularly adjustable to change the relation between the shaft parts connected thereby.

3. A device as defined in claim 2 comprising an integral rotor having rotor bodies fixed relative to the shaft part of the rotor, and in which said synchronizing means comprises a gear angularly adjustable with respect to said integral rotor.

4. A device as defined in claim 3 in which said angularly adjustable gear meshes with a gear connected to the adjustable rotor body and cooperating rotor.

5. A device as defined in claim 4 in which an angularly adjustable connection is provided between the gear connecting to said adjustable rotor body and the shaft part of the rotor of which said adjustable rotor body comprises a part.

6. A device as defined in claim 5 in which said integral rotor comprises two rotor bodies and the cooperating rotor comprises one rotor body fixed relative to the shaft part of the rotor and one rotor body angularly adjustable relative to the shaft part of the rotor.

7. A device as defined in claim 5 in which the integral rotor comprises three rotor bodies and the cooperating rotor comprises one rotor body fixed relative to the shaft part of the rotor and two rotor bodies independently adjustable angularly with respect to the shaft part of the rotor;

8. A device as defined in claim 2 comprising an integral rotor having rotor bodies fixed relative to the shaft part of the rotor, and in which said synchronizing means comprises a gear angularly fixed relative to said integral rotor.

9. A device as defined in claim 8 in which said gear meshes with a gear connected in angularly adjustable relation to the adjustable rotor body of the cooperating rotor.

10. A device as defined in claim 9 in which the shaft part of said cooperating rotor is connected in angularly adjustable relation with the last mentioned gear.

11. A device as defined in claim 9 in which an axially adjustable part having different sets of splines of different angularity is provided for adjusting the angular relation between different rotor bodies of the cooperating rotor.

12. A device as defined in claim 8 in which two rotors each having at least one adjustable rotor body cooperate in intermeshing relation with said integral rotor, and in which the gear angularly fixed relation to the integral rotor meshes with different gears each angularly adjustable relative to the adjustable rotor body of one of the cooperating rotors.

13. A device as defined in claim 1 in which the male rotor bodies on one rotor intermesh with female rotor bodies on a cooperating rotor and said cooperating rotor constituting the rotor including a rotor body angularly adjustable relative to the shaft part of the rotor.

HANS ROBERT NILSSON. SVEN IVAR TRULSSON.

References Cited in the file of this patent UNITED STATES PATENTS Number 

